Nurikabe


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Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions.

The rules are not so simple. :)
You have a grid of squares Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" (Islands in the Stream calls these "water" and "land" respectively). The black cells form "the nurikabe" (Islands in the Stream calls it "the stream"): they must all be orthogonally contiguous (form a single polyomino), number-free, and contain no 2x2 or larger solid rectangles (Islands in the Stream calls such illegal blocks "pools"). The white cells form "islands" (which is where Islands in the Stream got its name): each number n must be part of an n-omino composed only of white cells. All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot (non-numbered) cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square.

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Nurikabe


5x5 Easy Nurikabe | 5x5 Hard Nurikabe | 7x7 Easy Nurikabe | 7x7 Hard Nurikabe | 10x10 Easy Nurikabe | 10x10 Hard Nurikabe | 12x12 Easy Nurikabe | 12x12 Hard Nurikabe | 15x15 Easy Nurikabe | 15x15 Hard Nurikabe | 20x20 Easy Nurikabe

This Month
1. asdfhavcjklcjkl 00:23.17
2. Min._.下(KR)
99
00:26.68
3. chiimo 01:11.62
4. wam3988 01:17.63
5. 222champ 01:23.63
6. HackMan
107
01:25.03
7. MOONEE
16
01:37.98
8. Dorice
242
01:38.37
9. turkhuu
20
01:38.98
10. Tristal
47
01:39.72
11. Pngaea
18
01:47.30
12. raiRAT
47
01:58.28
13. FunAcroFly
70
01:58.74
14. Harry_Canyon
126
01:58.97
15. theboomboy
1
01:59.78
16. toryxthebanana#0
12
02:01.63
17. BigBen77 02:02.64
18. charlesa 02:09.92
19. cobracreeper1
7
02:25.19
20. TJ11235
8
02:51.60
This Week
1. Min._.下(KR)
99
00:28.85
2. wam3988 01:17.63
3. HackMan
107
01:25.03
4. MOONEE
16
01:37.98
5. Tristal
47
01:39.72
6. raiRAT
47
01:58.28
7. ambiorix 02:57.80
8. FunAcroFly
70
03:15.99
9. jdubs
136
03:41.74
10. charlesa 03:46.56
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Today
1. Min._.下(KR)
99
00:28.85
2. HackMan
107
02:15.41
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4.--- empty -----:--
5.--- empty -----:--
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MO3
1. numbrr
297
00:16.73
2. bearn
206
00:19.57
3. Min._.下(KR)
99
00:24.15
4. vowels
216
00:26.05
5. sfumato
166
00:26.65
6. haramey
230
00:28.31
7. Douglas Shamlin Jr.
693
00:32.25
8. qqwref
259
00:32.64
9.anonymous
10
00:33.59
10. miggy
127
00:34.69
AO5
1. numbrr
297
00:17.04
2. bearn
206
00:19.95
3. Min._.下(KR)
99
00:24.16
4. vowels
216
00:27.49
5. sfumato
166
00:28.12
6. haramey
230
00:28.77
7. Douglas Shamlin Jr.
693
00:31.44
8.anonymous
10
00:34.17
9. miggy
127
00:35.71
10. qqwref
259
00:35.91
AO12
1. numbrr
297
00:21.86
2. bearn
206
00:22.69
3. vowels
216
00:28.27
4. Min._.下(KR)
99
00:30.35
5. sfumato
166
00:33.67
6. haramey
230
00:35.19
7. Douglas Shamlin Jr.
693
00:36.08
8.anonymous
10
00:36.17
9. qqwref
259
00:43.40
10. jamiecjx
70
00:45.24
Robots / programmatic solversinfo  
1.Charlie Li
61
00:00.224
2.4s4f400:00.373
3.nbjohnson00:00.735

* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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2025-07-06 00:19:35

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